Ermac

The military. They can kill you within seconds from a distance whereas the suicide bombers have to be in close proximity. As long as you keep a cool head you can deal with the bombers. If you fight the military on foot head on, you're going to lose to their M16's. Plus, their tanks will make short work of any vehicle that you choose that isn't a tank.

GTAKid667

The Military, as Ermac. says, can kill you within seconds from a distance with their damaging M16's and in a vehicle, if you are not careful at driving you may come head to head with a Rhino, something you will surely regret.

The Suicide Bombers on the other hand are extremely accurate and will explode upon impact with Claude making him lose a hell of a lot of health, especially when there is more than one coming from different angles.

You can kill the suicide bombers pretty fast if you're doing it right. It is pretty easy actually if there are vehicles somewhere in the area. In the second or third mission of Ray, you have to help Phil to fight against the Columbians. Once you are done with it, you can purchase shotguns, M16's and rocket launchers. And with exact those weapons, it will be even easier to kill the suicide bombers. The army on the other hand is harder to fight with, considering the equipment they have. They are using M16's as guns, and Rhino tanks and Barracks OL trucks as vehicles. And then, there are the two police helicopters in the air and the cops on foot with their pistoles that follow you all the time.